Doux Ioannes of Cibyrrhaeot

Doux Ioannes of Cibyrrhaeot (1037-) was the doux of the Theme of Cibyrrhaeot and an anthypatos under the Byzantine Empire.

Biography
Ioannes was from the House of Bryennios, and he was a Greek Orthodox Christian. Ioannes married Duchess Margarita of Cibyrrhaeot and became the duke (doux) of the Theme of Cibyrrhaeot in southern Turkey. He was also an anthypatos (proconsul). During the Seljuk Empire's invasion of Turkey, he fought against them, but he was defeated at the Battle of Melitene on 3 June 1077 in a crushing defeat - many more were to follow.